Also known as The Merry Blacksmith and by many other names, this tune is originally from Ireland and dates back to at least the mid 19th century. The title Paddy on the Railroad was used in the USA, and probably refers to the many Irish laborers helped build America's railway system in the 19th century.
Ref: https://tunearch.org/wiki/Paddy_on_the_Railroad
Ref: https://thesession.org/tunes/72
: | D | D | DBm | EmA | |
D | D | GA | D | : | |
: | D | D | DBm | EmA | |
D | Bm | GA | D | : |